I think a lot of us have gone down that OHC parts rabbit hole over the years.
I have bought several engines in the past just for particular parts.
'69 sort of mirrors '66 in as far as one year only design and parts.
I think that '68-'69 1BC breathers are the same across the board.
You are correct on the elimination of the by-pass as well as the shortened water pump shaft.
I'm glad you were able to secure an intake, even with the added expense your still ahead with all the reserve parts now.
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When I die, I want to go peacefully like my grandfather did, in his sleep.
Not screaming like the passengers in his car. 
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